Abstract: Sliver defects appeared on surface of coldrolled sheet were studied by scanning electron microscope(SEM),and qualitatively analysis of dispersive spectrum(EDS) in Shougang Jingtang. The results show that the defect was caused mainly by Al2O3inclusions, mould powder and FeO. This kind of defect was effectively controlled by the modification of ladle slag to reduce the top slag oxidation, reasonable pure cycle time of RH and increasing the sedation time of ladle ensuring inclusion floating, optimizing performance of mould powder and structure of nozzle, control speed, decreasing argon blowing to reducing the liquid level fluctuation，reduce the tapping temperature and water descaling system reform measures, cold rolled steel strip surface defects by 0.59 %to below 0.25 %.

Key words: cold rolled steel plate, strip defect, inclusion, control